Fix JDI leak when the debuggee creates a lot of threads, while at the same the debugger is not sending any commands. The lack of commands being sent results in code not being triggered that normally would clear out unreachable listeners and also clear out ObjectReferences queued for disposal.
------------- Commit messages: - Fix thread memory leak Changes: https://git.openjdk.org/jdk/pull/12081/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=12081&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8297638 Stats: 194 lines in 3 files changed: 192 ins; 0 del; 2 mod Patch: https://git.openjdk.org/jdk/pull/12081.diff Fetch: git fetch https://git.openjdk.org/jdk pull/12081/head:pull/12081 PR: https://git.openjdk.org/jdk/pull/12081
